Depending on the consonant before the ending adjectives can be divided into two groups:
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hard group:
the hard consonant before -ий ending: добрий (kind), червоний (red), чистий (clean), низький (short);
all the possessive adjectives: мамин (mother's), батьків (father's);
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soft group:
the soft consonant before -ій, синій (dark blue), ранній (early), колишній (former, ex), справж ній (true);
adjectives with -їй ending: безкраїй (immense, endless).
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and a special group of adjectives with -ций ending, which is a part of -лиций (“лице” means “face”): груглолиций (round-faced), блідолиций (pale-faced).